A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second  e = 1.6 × 10-19 Coulomb

1.  6.25 × 1019  

2.  6.25 × 1015  

3.  6.25 × 1031  

4.  6.25 × 108

Subtopic:  Current & Current Density |
 78%
From NCERT
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The drift velocity of free electrons in a conductor is \(v\) when a current \(i\) is flowing in it. If both the radius and current are doubled, then the drift velocity will be:
1.  \(v\)
2. \(\frac{v}{2}\)
3. \(\frac{v}{4}\)
4. \(\frac{v}{8}\)

Subtopic:  Current & Current Density |
 73%
From NCERT
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A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohm, a current of 1 ampere flows in the circuit. How much current will flow if the terminals of the battery are connected directly?

1. 1 A 2. 2 A
3. 4 A 4. Infinite
Subtopic:  EMF & Terminal Voltage |
 67%
From NCERT
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The current I as shown in the circuit will be:

                 

1.  10 A

2.  203 A 

3.  23 A  

4.  53 A

Subtopic:  Combination of Resistors |
 61%
From NCERT
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A meter bridge is set up to determine unknown resistance x using a standard 10 Ω resistor. The galvanometer shows the null point when the tapping key is at a 52 cm mark. End corrections are 1 cm and 2 cm respectively for end A and B. Then the value of x is:

  

1.  10.2 Ω

2.  10.6 Ω

3.  10.8 Ω

3. 11.1 Ω

Subtopic:  Meter Bridge & Potentiometer |
 52%
From NCERT
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The resistivity of iron is 1 × 10–7 ohm m. The resistance of iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm m will be :

(1) 1 × 10–7

(2) 2 × 10–7

(3) 4 × 10–7

(4) 8 × 10–7

Subtopic:  Derivation of Ohm's Law |
 67%
From NCERT
PMT - 1983
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The resistivity of a wire :

1. Increases with the length of the wire
2. Decreases with the area of cross-section
3. Decreases with the length and increases with the cross-section of the wire
4. None of the above statement is correct
Subtopic:  Derivation of Ohm's Law |
 74%
From NCERT
PMT - 1984
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Drift velocity vd varies with the intensity of electric field as per the relation: 

1. vdE

2. vd1E

3. vd = constant

4. vdE2 

Subtopic:  Current & Current Density |
 78%
From NCERT
PMT - 1981
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In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be :

(1) 4 volts

(2) 4 amperes

(3) 2 amperes

(4) 2 volts

Subtopic:  Current & Current Density |
 90%
From NCERT
PMT - 1984
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The specific resistance of a wire is ρ, its volume is 3 m3 and its resistance is 3 ohms, then its length will be 

(1) 1ρ

(2) 3ρ

(3) 1ρ3

(4) ρ13 

Subtopic:  Derivation of Ohm's Law |
 80%
From NCERT
PMT - 1984
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